original description Herdman, W. A. (1891). A Revised Classification of the Tunicata, with Definitions of the Orders, Suborders, Families, Subfamilies, and Genera, and Analytical Keys to the Species. Journal of the Linnean Society of London, Zoology. 23(148): 558-652., available online athttp://dx.doi.org/10.1111/j.1096-3642.1891.tb02403.x[details]